In the heart of Michoacan, a seemingly pious woman hides a secret. By day, she's a devoted wife; by night, she's 'Zorra de la piedad,' a shameless puta who craves anal ecstasy. Her lover, a rough, demanding man, satisfies her forbidden desires, pounding her ass with wild abandon. Her cries of pleasure echo through the streets, a haunting melody of sin and lust.